Rostock 2019 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 25: Poster: Quantum Optics and Photonics I

Q 25.28: Poster

Dienstag, 12. März 2019, 16:30–18:30, S Atrium Informatik

Towards an experimental implementation of topological interfaces and chiral edge modes for fermions in an optical lattice — •Sandra Buob, Michael Messer, Frederik Görg, Kilian Sandholzer, Joaquín Minguzzi, Konrad Viebahn, Rémi Desbuquois, and Tilman Esslinger — Institute for Quantum Electronics, ETH Zürich, Zürich, Switzerland

Chiral edge modes are known from the quantum Hall effect where they emerge along the boundary at the edge of a sample. In general, they are related to interfaces between distinct topological regions. The creation of such topological interfaces in an optical-lattice realization of the Haldane model for cold atoms has been proposed by N. Goldman et al. (Phys. Rev. A 94, 043611 (2016)). In this proposal, interfering laser beams together with a near commensurate beam form a superlattice potential with a linear varying site offset across the confined atomic cloud. At a critical site offset, a topological interface forms and induces edge modes, which can be controlled in position, localization length and chirality. Here, we present the detailed setup of the dual laser system with tunable relative frequency. In addition, we show characterization measurements of the stability in frequency as well as intensity of the lasers.